JPH0481252A - Method for centering guide roll for cast slab in bending type continuous caster - Google Patents

Abstract

PURPOSE:To execute gage measurement from outer part and to execute the measurement of shifting quantity of guide rolls and the centering by using peripheral face on at least two pieces of guide roll shafts at inlet side and outlet side for the cast slab in plural segments as the measuring face with a gage to adjust the position of adjoining segments. CONSTITUTION:In the guide rolls arranged in the adjoining segments 1, 2, respectively, as the projected shafts 4b, 6b arranged to out of pass-line in at least two pieces of the guide rolls 4, 6, which are arranged at the inlet side and outlet side for the cast slab, respectively and counted from the inlet side end and the outlet side end, are as concentrical with roll barrel parts 4a, 6a in the guide rolls 4, 6, by informing the positions of peripheral faces on the projected shafts 4b, 6b, positions of peripheral surfaces on the roll barrel parts 4a, 6a contacting with the cast slab can be informed. Therefore, by using the peripheral faces on the projected shafts 4b, 6b as the measuring faces with the gage A, the shifting quantity of guide rolls set in the adjoining segments 1, 2, respectively, can be measured.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a continuous casting machine for molten metal such as molten steel, particularly a continuous casting machine of a curved type in which a curved pass line is formed by a plurality of segments. Concerning centering technology for single guide rolls.

[Conventional technology]

This curved continuous casting machine has a structure in which the molten metal is received from the tundish and sent into the mold, and then the slab is pulled out through a secondary cooling zone and flows to the straightening device. A large number of guide rolls are arranged in a continuous curved path in order to gradually change the orientation of the slab from vertical to horizontal.

These guide rolls are arranged above and below the pass line of the slab, and numerically, a plurality of sets of guide rolls are incorporated into one segment. Then, the alignment of the guide rolls is set by incorporating a plurality of segments into a line as one unit and adjusting the respective postures of adjacent segments.

For example, in a conventional continuous casting machine that produces slabs with a thickness of about 200 mm, the position of the guide roll is adjusted using a curve gauge 8, as shown in FIG. 5(a). In the figure, upstream and downstream segments) 51.
A plurality of guide rolls 53.5 each incorporated in 52
4, three guide rolls 5 each on the side where the segments 51 and 52 are adjacent to each other and below the pass line of the slab.
Set gauge A so that it spans 3.54. This gauge Δ is placed on the peripheral surface of the furthest guide roll 53.54 with reference thickness gauge B in between, and the gap δ (
The misalignment can be determined by measuring the size of the image (see FIG. 5(b)). Note that FIG. 5(b) is a view taken along the line ■-■ in FIG. 5(a). For such measurement work, a worker must move the guide rolls 5 above and below the pass line.
3.54, set gauge A and standard thickness gauge B, and measure gaps.

[Problems to be Solved by the Invention] However, in a continuous casting machine for thin slabs with a thickness of about 50 mm, the distance between the upper and lower rolls is only about 50 mm, and the roll pitch of the guide rolls 5354 is only about 200 mm, making the work difficult. It's quite difficult for people to get into it. Moreover, especially when the radius of curvature of the pass line of the slab is about 3 m, even if an attempt is made to widen the interval between the guide rolls 53 and 54, they will interfere with each other, making it almost impossible for workers to enter. On the other hand, in continuous casting machines for thin walls, gauges and reference gauges cannot be set on the circumferential surfaces of the guide rolls 53 and 54, and the positions of the guide rolls 53 and 54 cannot be set online.

Misalignment of the guide rolls 53, 54 has a significant impact on the quality of the slab, and if the alignment is incorrect, it must be corrected immediately. Therefore, if it is not possible to measure the misalignment, which is a prerequisite for such correction work, there will be a major problem in the production of slabs, and if the work is time-consuming, it will also affect productivity.

The problem to be solved by the present invention is to establish a means by which the alignment of guide rolls can be measured and corrected in a simple and reliable manner.

[Means for solving problems]

The method for centering guide rolls for slabs in a curved continuous casting machine of the present invention includes at least two guide rolls counted from each of the inlet side and outlet side of the slab of the segment, which protrude outward from the pass line. A protruding shaft is provided concentrically with the roll cylinder of the guide roll, and the amount of misalignment of each guide roll of the adjacent segment is measured using the circumferential surface of the protruding shaft as a measuring surface with a gauge, and based on this measurement value. It is characterized by adjusting the positions of adjacent segments.

[Effect]

Among the guide rolls provided in each of the adjacent segments, at least two guide rolls provided on the inlet and outlet sides of the slab are provided outside the pass line of at least two guide rolls counted from the inlet and outlet ends thereof. Since the protruding shaft is in the same window as the roll cylinder of the guide roll, knowing the position of the circumferential surface of the protruding shaft allows also knowing the position of the circumferential surface of the roll cylinder that contacts the slab. Therefore, if the circumferential surface of the protruding shaft is used as a measurement surface using a gauge, the amount of deviation of the guide rolls arranged in each of the adjacent segments can be measured.

〔Example〕

FIG. 1 is a front view of a main part for explaining the present invention in detail, and FIG. 2 is a schematic vertical cross-sectional view taken along the line >I in FIG.

The curved section of the continuous casting machine has a plurality of segments arranged, and guide rolls provided on these segments constitute a pass line for the slab. Figure 3 shows the arrangement of segments, in which segment 2 on the downstream side is arranged with a different angle of inclination relative to segment 1 on the upstream side, and other multiple rows of segments are provided by similar combinations. . Each segment 1.2 has guide rolls 3.4 and 5.6 installed above and below the pass line of the slab. The guide rolls 3 to 6 for each segment 1.2 are arranged so that the slabs draw arcuate pass lines.

Among the lower guide rolls 4.6 provided in segment 1.2, the three placed at the upstream and downstream ends of the pass line are adjusted in position between segments 1.2 in the same manner as in the conventional method. Use it for. FIG. 4 is a longitudinal sectional view of the guide roll 4 provided at the outlet end of the upstream segment 1, viewed in the path direction. The guide roll 4 has a bearing box 7a at both ends of its roll cylinder 4a.

7b, and a protruding shaft 4 from one bearing box 7a.
b is sticking out outwards. This protruding shaft 4b has its outer peripheral surface formed concentrically with the roll body 4a that contacts the slab. Such a protruding shaft 4b is similarly provided on two guide rolls 4 upstream of the guide roll 4 at the outlet end. Further, the three guide rolls 6 arranged in the path direction from the artificial end of the downstream segment 2 are also provided with similar projecting shafts 6b opposite to the roll cylinder 6a that contacts the slab.

The mutual alignment of adjacent segments 1.2 is carried out by bearing housing 7.
This is done by applying a gauge A and a reference thickness gauge B to the protruding shafts 4b and 6b protruding outward from a to measure the amount of roll alignment deviation. That is, in contrast to the conventional method in which the gauge A was inserted into the upper guide roll 3.5 to measure the gap between the lower guide roll 46 and the outer peripheral surface of the roll cylinders 4a, 6a, The protruding shafts 4b and 6b protruding outward are used instead. As shown in FIG.
, 6 are placed on the protruding shafts 4b and 6b, respectively, and gauge 8 is placed on top of this. Then, the lower surface to the gauge and the protruding shaft 4b of the arbitrary guide roll 4°6, 6
Measure the gap δ between the protruding shafts 4b and 6b (you can also measure by placing a gauge directly on the protruding shafts), since the protruding shafts 4b and 6b correspond to the roll cylinders 4a and 5a of the respective guide rolls 4.6, The value of the gap δ obtained by measurement is the value of the gap δ between the roll cylinder 4a,
This represents the amount of alignment deviation of 6a. Therefore, if the relative position and orientation between segments 1 and 20 are reset according to the value of the gap δ, segments 1, 2
The alignment of each of the guide rolls 3 to 6 can be adjusted. Note that alignment adjustment using the protruding shafts 4b and 6b can be similarly performed by providing protruding shafts on three guide rolls placed at the inlet and outlet ends of each of the other adjacent segments. I can do it.

In this way, the mutual position adjustment between the segments 1 and 2 can be performed using the external protruding shafts 4b and 6b without the worker getting between the guide rolls 3 to 6.
~6 alignments can be adjusted online.

In addition, in the embodiment, the guide roll 4 below the pass line,
Although the protruding shafts 4b and 6b are provided on the upper guide roll 3.5, a similar protruding shaft may be provided on the upper guide roll 3.5 and this may be used as the measurement surface by the gauge 8. Moreover, although three protruding shafts are provided on the exit side or the inlet side of the segment 1.2, two each may be provided.

〔Effect of the invention〕

The following effects can be achieved by the present invention.

[1] Gauge measurements can be performed from outside without the need for workers to enter the line; the gauge can be inserted between the upper and lower guide rolls, or workers can enter the line to measure the amount of deviation. There is no need for this, and the amount of deviation can be easily measured and the centering of the guide roll can be easily performed.

(2) Even in equipment where the pitch of the guide rolls is narrow or the radius of curvature is small, such as for thin-wall casting, the amount of deviation can be measured from the outside, so the alignment of the guide rolls can always be properly maintained, resulting in high-quality casting. It becomes possible to manufacture pieces.

(3) Work time can be shortened and operation rate can be improved.

[Brief explanation of the drawing]

Fig. 1 is a front view of the main parts of the vessel for explaining the alignment adjustment method of the present invention, Fig. 2 is a schematic vertical cross-sectional view taken along the Main part front view of segments arranged in the curved part of the casting machine, 4th
The figure is a cutaway front view showing the assembly structure of a guide roll with a protruding shaft, FIG. 5(a) is a front view showing a conventional method for measuring the amount of deviation, and FIG. FIG. 1.2; Segment 3.4.5, 5 guide roll 4a, [ia: C1-roll cylinder 4b, 6b:
A protruding shaft? a, 7b: Bearing box

Claims (1)

[Claims] 1. In a curved continuous casting machine in which a curved pass line is constituted by a plurality of segments, and guide rolls for slabs are installed in each of the segments with the pass line sandwiched therebetween, the entrance side of the slab of the segment and at least two guide rolls counted from each of the exit sides are provided with protruding shafts protruding from the pass line to the outside concentrically with the roll cylinder of the guide rolls, and the circumferential surface of the protruding shafts is adjacent as a measurement surface by a gauge. Centering of guide rolls for slabs in a curved continuous casting machine characterized by measuring the amount of misalignment of each guide roll of each segment and adjusting the positions of adjacent segments based on this measurement value. Method.